Sayfer

Sayfer is a leading Web3 and blockchain cybersecurity firm headquartered in Tel Aviv, Israel, founded in 2018. The company specializes in offensive defense strategies, combining hacker-minded research with deep blockchain expertise to protect decentralized protocols, DeFi projects, NFT platforms, and crypto infrastructure from cyber attacks. Sayfer serves 100+ global clients, has secured over $10.5 billion in digital assets through audits, and maintains a zero-client-hacks track record backed by a money-back guarantee.

Sayfer's team brings 54 combined years of cybersecurity experience and maintains compliance expertise across AICPA, HIPAA, GDPR, ISO 27001, SOC2, and PCI DSS frameworks. The firm is known for its rigorous hiring of top security researchers and continuous learning culture, making it a trusted partner for blockchain projects including Tenderly, Tezos, Polkadot, MetaMask, Binance Smart Chain, and StarkWare.

Core Products/Services

Sayfer offers five main cybersecurity services tailored to Web3 and blockchain companies:

• Smart Contract Audit: Comprehensive line-by-line code review by two or more auditors, covering vulnerability identification, design issues, gas optimizations, contract fuzzing, and risk assessment. Tiers include Standard (2-3 weeks), Premium (3-4 weeks with bug bounty inclusion), and Elite (custom). All engagements include complimentary retesting and 5 hours of security consulting.

• Penetration Testing: Controlled simulated cyber attacks covering web applications, mobile apps (iOS/Android), APIs, and cloud infrastructure. Tiers include Lite (2-4 weeks, OWASP Top 10), Premium (4 weeks, OWASP WSTG v4.2 and MSTG v1.4, ISO 27001/SOC2/HIPAA/PCI DSS certifications), and Elite (custom monthly plans).

• Cloud Infrastructure Audit: Security assessment of AWS, GCP, and Azure configurations covering IAM policies, storage permissions, networking, logging, and compliance alignment with SOC2, ISO 27001, HIPAA, and GDPR frameworks.

• Private Key Protection: Institutional-level audit of wallet and cryptographic key management procedures for cryptocurrency companies and protocols, including risk identification, recommendations, and final certification.

• Security Consulting: Ongoing monthly Web3 and blockchain security advisory including comprehensive risk assessment, customized security roadmap, dedicated security advisor, and periodic penetration tests.

Key Strengths

Sayfer differentiates itself through its "offensive defense" methodology — applying the mindset of malicious actors to identify and remediate vulnerabilities before attackers can exploit them. The firm conducts active vulnerability research, specializes in novel blockchain security threats, and provides triple-layer protection across application code, infrastructure, and key management.

The company has built a specialized niche in MetaMask Snap security audits, having audited snaps for Tenderly, Pianity, AnChain.AI, Demystify, Aleo, Polkadot, and Leap Wallet, establishing itself as a go-to auditor in the MetaMask ecosystem.

Notable Clients/Projects

Sayfer's public audit portfolio includes smart contract audits for GoodDollar, Bolide, Zenpool, PetCoin, TopBridge, and Request Finance, as well as penetration tests for centralized exchanges and payment platforms. Notable long-term clients include Tenderly, Tezos, Polkadot, MetaMask, Binance Smart Chain, and StarkWare.

Why Choose Sayfer

Sayfer combines deep Web3-native expertise with proven security research capabilities, offering a money-back guarantee and zero-hack track record. Their lean, specialist team enables fast, high-value engagements without the overhead of large consultancies. Clients receive not just a report but actionable remediation guidance, retesting, and ongoing consulting support.